Calendar doesn't sync M365 delegates

Hi

Same problem .For our company it only occurs on one MacStudio with OS Ventura and for two calendar delegations among ten. I have tried too reset calendar, deactivate reactivate M365 account. Nothing change. Thanks for your help

I have gone so far as to swap out macs, use new accounts, completely restore macs with clean installs of the OS and, because I happen to have a new Mac arrive, tried that. All with the same results. It seems like it might be on Microsoft's end, but it's not helpful when the system is opaque for you to shunt it off. The error is the communication between both companies' products and frankly, we need Apple to step up and get the engineering team on this.

And just glancing at StackOverflow, it's not unknown. https://stackoverflow.com/questions/40822649/error-getting-all-calendars-error-domain-ekcaderrordomain-code-1013-null-sw

Hi vieiderr,

We'd like to share some suggestions to help you with Calendars you add. The best available guidance is the steps in Add or delete calendars on Mac - Apple Support and if this issue has an isolation to Microsoft, you will want to reach out to them via the guidance in Contact a third-party vendor - Apple Support and if additional reference happens from Microsoft, you can contact support via Apple Support.

Thanks for using Apple Support Communities.